US Bridges

NFSR 104.D over Homestake Tunnel Outlet

Fair

Lake County, Colorado · May Queen Cg · Structure no. 021201000001002

Built
1984
41 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
41
2003 count
Owner
Federal
U.S. Forest Service

About this bridge

NFSR 104.D over Homestake Tunnel Outlet is a concrete slab carrying NFSR 104.D over Homestake Tunnel Outlet in Lake County, Colorado. It was built in 1984, so it is 41 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 41 vehicles a day, projected to reach 86 by 2023. The structure is 27 ft (8.2 m) long and 21 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesNFSR 104.D
CrossesHomestake Tunnel Outlet
LocationMay Queen Cg
RouteFederal Lands Road 104.D
CountyLake County
StateColorado
Coordinates39.28126, -106.4413
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating22.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span24 ft (7.4 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41 (2003)
Projected traffic86 by 2023
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$188,000
NavigationNo navigation control on waterway

Frequently asked questions

When was NFSR 104.D over Homestake Tunnel Outlet built?

It was built in 1984, making it 41 years old in 2025.

What condition is NFSR 104.D over Homestake Tunnel Outlet in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does NFSR 104.D over Homestake Tunnel Outlet carry?

About 41 vehicles per day (2003 count).

How long is NFSR 104.D over Homestake Tunnel Outlet?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.4 m) and a deck 21 ft wide.

Who owns NFSR 104.D over Homestake Tunnel Outlet?

It is owned by the U.S. Forest Service.